SAP Netweaver Portal

1. Check if the server is down or not by using the system information link. ( you can achieve that by going to http://:PORT.
2. Goto System administration=>Monitoring
In the left side find the following items to check:
1.Request Summary
2.Request Overview
3.Component overview
4,Thread Overview
5.Object Locking
6.Activity Reports
3. Login into NWA goto System Management ==>Monitoring ==> Java System Reports

The following reports are available to check the situation:
1.Capacity planning
2.Resource Consumption
3.Error statistics
4.Application activities
5.Slowest Requests in details
6.Slowest requests
7.Slowest Componets
8.User activites
9.Current activities
10.mointor browser
4. Use these metrics to determine the state of the portal under system admin:
EP Workload in Requests <1000(Healthy) 1000-2000(Monitor/Caution) 2000(Critical) 1 hour(Duration)
iView Response Time Average <200 ms 200-500 ms >500ms
EP Request (Manager) Avg. Response Time <100 ms 100-200 ms >200 ms
HTTP Sessions <2500 2500-5000 >5000 1 hour
PCD Lookup Avg. Response Time <25 ms 25-50 ms >50 ms
LDAP Response Time <25ms 25-50ms >50ms
Enqueue Lock Operations <500 500-2000 >2000
Enqueue Average Response Time <10 ms 10 - 25 ms >25 ms
Application Threads 30-Oct 30-50 >50
System Threads 25-Oct 25-40 >40
Total Garbage Collection time (%) <2% 2% - 4% > 5% Day
Full Garbage Collection Count <5 5-10 >10 24 hours
Full Garbage Collection Avg. Duration <3-5 seconds 5-10 seconds >10 seconds
Minor Garbage Collection Avg. Duration 0-200ms 200-500ms >500ms
JDBC SQL Query/Update Response Time <100ms 200-500ms >500ms

5. In most cases it is the GARBAGE COLLECTION …..so here is my recommendation:
Read SAP notes 634689 and 723909..also refer these links:
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/9771c65d-0501-0010-2c90-ad2a2f2487c7
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/c1c8a123-0e01-0010-f8bf-a2d8ea8ec5b7